Find (fg)(x)

f(x)=4x^2 + x^4

g(x)= sqrt(x^2 + 4)

a.(4x^2 + x^4)(x^2 + 4)^1/2

b.-3x + 2/x^2

c. x^2 /-3x + 2

d.3x^4 + 2x^3
last option is D that isnt on screen.

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Interpret the following expression (5y^2-7)^3/(2y)^2